The Merger block has a very simple, yet important, purpose: It lets you merge any input. If Merger is set like it is in the image above, whatever is coming into it will be multiplied, and then fed to the output.
Of course, you can have multiple inputs to any shader to mix them, but other shaders also apply other calculations, such as color, noise, etc., whereas Merger doesn't. It just merges the inputs and gives a single output. This can give you more control over the mixing, and give you a nice unified output.
Value To Color: Select a blend operator. This works just like all of the blend operators in messiah-- + adds them, - subtracts them, etc.
Dither: Dither translates the floating point data to 8bit data.
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